Compilare: main.cpp: In function 'void solve()': main.cpp:34:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[tata].size();i++) ~^~~~~~~~~~~~~~~ main.cpp: In function 'void read()': main.cpp:13:27: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d",&n,&k); ^ main.cpp:15:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d",&x,&y); ^